JPH0994661A - On-vehicle generator provided with welding function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unnecessitate a finishing power source after welding without damaging a car battery by constituting a generator so that a direct current power source of a welding equipment, a high voltage alternating current equal to the commercial AC 100V and a vehicle driving direct current low voltage from one small generator for general purpose. SOLUTION: The voltage of a direct current high voltage source 2 is, for example, controlled to DC 120 to 140V by detecting the output voltage of the direct current high voltage source 2 with a voltage detector 2b' of a direct current voltage stabilizing circuit 2b and controlling the current between a collector and an emitter of a transistor as a current controller 2b'' based on this voltage. Further, the output of the direct current high voltage source 2 is converted to a rectangular wave single phase alternating current by progressively changing a switching element based on the control signal outputted from an inverter control part 3b. The low voltage three phase alternating current output of a generator 1 is rectified to the direct current with a three phase both wave rectifier 4 and it is supplied to a welding equipment 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generator using a running engine mounted on a vehicle as a drive source, and particularly to a DC low voltage current required for vehicle operation and a high power equivalent to a commercial power source such as single-phase AC100V. The present invention relates to a vehicle-mounted power generator with a welding function capable of stably supplying a voltage alternating current and a DC power source necessary for arc welding.

[0002]

2. Description of the Related Art Conventionally, as a power source for arc welding using a generator of an automobile, for example, JP-A-50-3634.
There is one shown in Japanese Patent Publication No. The technical content disclosed here is to provide a switch for switching whether to supply the DC output of the generator to a normal regulator or to an outlet, and for the outlet, a battery different from the vehicle battery. Are electrically connected in parallel to serve as a power source for arc welding, and a stable DC output is obtained during arc welding.

[0003]

However, in the above method, since the output of the outlet is direct current, when finishing is to be performed by a grinder or the like after welding, a stable power is supplied to the grinder or the like. Inevitably, a separate AC100V power source must be prepared, which causes problems such as an increase in the weight of the vehicle mounted, a deterioration in the fuel consumption of the vehicle, and a reduction in the loading capacity of the vehicle.

Further, when the switch is switched to the outlet side, the output voltage of the generator is connected to the vehicle battery through the resistor, so that the voltage applied to the vehicle battery is suitable for charging, for example. DC14-1
There has been a problem that the voltage range of 4.5 V is greatly exceeded, the vehicle battery is overcharged, and in the worst case, the vehicle battery is damaged.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above, and uses a traveling engine for a vehicle as a drive source and a first stator coil that generates a high-voltage alternating current and a low-voltage alternating current. Generating a second stator coil and the first stator coil
And a field coil that generates a magnetic field that acts on the second stator coil, a first rectifier that rectifies the output current of the first stator coil, and an output current of the second stator coil. The outputs of the second and third rectifiers for rectifying and the output of the first rectifier are stabilized by a DC voltage stabilizing circuit and are converted into a stabilized high-voltage alternating current equivalent to that of a commercial AC power source via an inverter circuit. An on-vehicle power generator with a welding function, wherein the output of the second rectifier is used as a DC power source for welding and the output of the third rectifier is supplied to a vehicle battery for traveling, which excites the field coil. A current control means for controlling the current is provided, and an external output control means for shutting off the output of the high voltage alternating current and a charge control means for shutting off the application of the charging current to the vehicle battery are provided. When using the DC power supply for welding, when the output of the high-voltage alternating current and the charging current are cut off to reduce the load on the generator, and when the DC power supply for welding is not used, Supplying a charging current to the vehicle battery while controlling an exciting current of a field coil so that an applied voltage of the vehicle battery becomes an optimum voltage for charging the vehicle battery, and cutting off an output of the high voltage alternating current It is intended to provide a vehicle-mounted power generator with a welding function for canceling.

Further, according to the present invention, the vehicle idle-up control means is provided, and when the DC power source for welding is used, the output of the generator is increased by increasing the rotation speed of the vehicle running engine. An on-vehicle power generator with a welding function is provided.

Further, the present invention is based on the operation of a welding switch which is constructed integrally with the welding device and is electrically connected in series with the running engine start switch of the vehicle when the DC power source for welding is used. The present invention provides a vehicle-mounted power generator with a welding function in which at least one of the output of the high-voltage alternating current and the charging current is shut off.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a circuit configuration of an on-vehicle power generator with a welding function used in an embodiment of the present invention. The generator used in this embodiment is a general-purpose small on-vehicle generator 1,
It is arranged immediately behind the vehicle running engine (not shown) as a drive source.

In the generator 1, one end of a first stator coil 1a for generating an AC current of AC 100V is connected in a Y shape to form a stator coil portion 1'for three-phase output, and each winding of the stator coil 1a is formed. The tap 1b is taken in the middle of the step 1 and is used as a second stator coil for generating a three-phase low-voltage alternating current. Then, the other end of each stator coil 1a is connected to the connection terminals 1c, 1d, and 1e provided on the generator 1 to form a three-phase high-voltage AC output terminal of AC100V. In addition, the output of each tap 1b is the same as the connection terminals 1f, 1g,
Connect to 1h to make a three-phase low-voltage AC output terminal.

On the other hand, a field coil 1i for generating a magnetic field acting on the stator coil portion 1'is provided, and the field coil 1i is provided.
One end of i is grounded to the casing of the generator 1, and the other end is connected to the connection terminal 1j. Then, the ground terminal 1k electrically connected to the casing of the generator 1 is provided.

FIG. 2 shows a schematic circuit diagram of an on-vehicle power generator according to an embodiment of the present invention. In the figure, 2a is a three-phase double-wave rectifier, which rectifies the output current of the three-phase AC 100V of the generator 1. The generator 1 and the rectifier 2a
And a contact portion 7a of a relay 7 which will be described later for electrically interrupting the electrical connection, are provided so as to interrupt the circuit when an exciting current flows through the coil of the relay 7 as described later. To do. And, for example, as already proposed by the applicant of the present invention in Japanese Patent Laid-Open No. 1-259798,
The output of the rectifier 2a is stabilized via the DC constant voltage stabilizing circuit 2b, and the smoothing capacitor 2d is connected in parallel to form the DC high voltage source 2. At this time, in order to secure a high-voltage alternating current output equivalent to the single-phase AC 100V that is the output of the vehicle-mounted power generator in the present embodiment, the output voltage of the DC high-voltage source 2 is set to the voltage detection unit of the DC constant voltage stabilizing circuit 2b. 2b ', and the collector-emitter current of the transistor, which is the current controller 2b ", is controlled based on the detected voltage, so that the voltage value of the DC high voltage source 2 is, for example, DC120.
The voltage is controlled to be ~ 140V.

Further, in this embodiment, the output of the DC high voltage source 2 is supplied to the commercial single-phase AC 100V by the inverter circuit 3.
It is converted into a rectangular wave alternating current with the same effective value as the power supply of. That is, the inverter circuit 3 is composed of four switching elements Q1 to Q4 (transistors in the figure) and switching element protection diodes D1 to D4 connected in parallel and in opposite directions to the switching elements Q1 to Q4, respectively. Switching unit 3a and switching unit 3
It is composed of an inverter control unit 3b for controlling a.

Further, in this embodiment, as shown in FIG.
By sequentially switching the switching elements Q1 to Q4 based on the control signal output from the inverter control section 3b, the output of the DC high voltage source 2 is converted into a rectangular wave single-phase alternating current. This control method is similar to, for example, Japanese Patent Publication No. 7-46907, which has been already proposed by the applicant of the present invention. The control method affects the influence of the parasitic capacitance of the switching element and the inductive load when no load is applied to the output terminal of the inverter circuit 3. T1, T
It works extremely effectively in preventing the influence of the induced back electromotive force when it is connected to 2. The switching element is a power MOS.
By using the FET, the ON resistance of the element can be lowered to improve the conversion efficiency, heat generation can be suppressed, and the device can be further downsized. In this case, since the power MOSFET is structurally formed with the parasitic diode in the reverse direction in parallel, D1 to D4 may be excluded from the circuit.

The low-voltage three-phase AC output of the generator 1 is
It is rectified into a direct current by the three-phase double-wave rectifier 4 and supplied to the welding device 5. The welding device 5 includes a welding holder portion 5a that is electrically connected to the positive side output of the three-phase double-wave rectifier 4 and holds a welding rod, a switch portion 5b, and a negative side of the three-phase double-wave rectifier 4. It is composed of the work piece 5'which is electrically connected to the output of the
Is set to. In the present embodiment, the switch unit 5b is electrically connected in series with the key switch 6 described later, and when the key switch 6 is ON and the switch unit 5b is ON, the switch unit 5b is connected to the coil of the relay 7. An electric current flows so that the contact 7a is cut off, and
The inputs of the thyristor control unit 11 and the vehicle idle-up control unit 13, which will be described later, become "H" level. However, when only the switch unit 5b is OFF, the relay 7 is turned OFF and the contact unit 7a is turned ON,
A high voltage alternating current equivalent to a commercial AC100V can be output from the terminals T1 and T2, and the thyristor control unit 11
And the input of the vehicle idle-up control unit 13 becomes "L" level.

On the other hand, the low-voltage three-phase AC output of the generator 1 is
The three-phase thyristor is supplied to the dual-wave rectifier 8. At this time, when the input of the thyristor control unit 11 is at "L" level, the thyristor control unit 11 outputs a "H" level thyristor control signal, and the low voltage three-phase AC output is output by the three-phase thyristor double-wave rectifier 8. The current is rectified and supplied to the vehicle battery 9 and the vehicle electrical components 10, and a current control circuit 12 for controlling the exciting current of the field coil 1i of the generator 1 is electrically connected in series via the key switch 6.

Then, the current control circuit 12 includes the voltage detector 1
2a and a current control unit 12b, which are transistors, and the output voltage of the three-phase thyristor double-wave rectifier 8 is detected by the voltage detection unit 12a.
Output voltage is the optimum voltage value for charging the vehicle battery 9 14-14.5V (when using 12V battery)
Thus, the collector-emitter current of the transistor, which is the current controller 12b, is controlled so that still,
When the output voltage of the three-phase thyristor double-wave rectifier 8 is lowered to, for example, about DC9V which is an obstacle to running of the vehicle, the field coil 1i of the generator 1 has a function of blocking the flow of the exciting current. Therefore, the vehicle battery 9 is prevented from running up.

On the other hand, the input of the thyristor control unit 11 is "
In the case of the H "level, the thyristor control unit 11 outputs the" L "level thyristor control signal, and the low voltage three-phase AC output is cut off by the three-phase thyristor double-wave rectifier 8 and is not output. And switch section 5b
When each is ON, the high voltage alternating current output and the low voltage DC output to the vehicle battery 9 and the vehicle electrical components 10 are cut off, and the exciting current based on the output voltage of the vehicle battery 9 is applied to the generator 1. A low-voltage three-phase AC output is generated by being applied to the field coil 1i, and the low-voltage DC current rectified by the double-wave rectifier 4 is supplied to the welding device 5. Therefore, the total output power of the generator 1 is entirely the welding device 5
And the stable arc welding can be performed in the welding device 5. It should be noted that since the time required for one welding operation is only a few seconds and the vehicle battery 9 is in the charged state during the other time, a situation in which the vehicle battery 9 goes up due to the welding operation does not occur. .

In the present embodiment, a vehicle idle-up control section 13 is provided in addition to the above-mentioned configuration. The vehicle idle-up control unit 13 is technically the same as that disclosed in, for example, Japanese Patent Publication No. 5-74297 proposed by the applicant of the present invention. In this embodiment, the welding device 5 is used as the condition for idle up.
When the switch unit 5b of the vehicle is turned on, the vehicle idle-up control unit 13 detects the "H" level input and outputs an idle-up control signal as described above. Is controlled, the rotational speed of the running engine is increased, and the output of the generator 1 is also increased accordingly. As a result, the electric power supplied to the welding device 5 also increases, and more stable arc welding can be performed.

In the vehicle-mounted power generator with a welding function of this embodiment having the above-described structure, the DC power source of the welding device 5 and the commercial AC 100V are equivalent to the output of one generator 1 driven by the running engine. By obtaining a high voltage alternating current having an effective value and a low voltage DC output for running the vehicle, it is possible to install all of the devices in the engine space of the vehicle.

Further, in the on-vehicle power generator with a welding function of this embodiment, at the time of welding, other outputs are cut off and the rotational speed of the running engine is increased to increase the output of the generator 1, so that the shape is It is not necessary to use a large generator for large electric power, the circuit configuration is simple, the number of parts used is small, and it is possible to manufacture with only commercially available parts. Therefore, it is possible to easily procure parts and to keep the manufacturing cost low. In addition, the circuit can be arranged in a distributed manner for each constituent element as needed, so that the entire circuit can be housed in the engine space of a small automobile. Further, it is possible to maintain a sufficient output voltage even for a large load and to reduce energy loss, so that it is possible to provide a highly efficient vehicle-mounted power generation device at a low price.

Although the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and can be carried out in any manner as long as the configurations described in the claims are not changed. For example, in the present embodiment, the generator and the rectifier have three phases, and the high-voltage alternating output current has a single phase, but the same effect can be obtained even if they are reversed. Further, by continuously varying the control signal applied to the switching element, a commercial single-phase AC100V
It is also possible to use the same sine wave AC output as that of the power supply of, and it can be arbitrarily implemented as needed. However, in this case,
Since the switching element generates a large amount of heat, it is needless to say that separate heat radiation measures must be taken. Furthermore, in the present invention, the rectifier 4 may be a three-phase thyristor rectifier, and the voltage may be supplied to the welding device 5 only when the switch portion 5b of the welding device 5 is ON.

[0022]

According to the on-vehicle power generator with welding function of the present invention, one general-purpose small generator is used for a DC power source of the welding device, a stable high-voltage alternating current equivalent to a commercial AC 100V, and a vehicle operation. With the configuration that obtains the DC low voltage, it can be arranged in the engine space of the vehicle as needed. In addition, since the output is cut off during welding, the generator only needs to supply the electric power required for welding during welding, so it is possible to supply sufficient voltage to the welding machine and at times other than during welding. In addition, since it is possible to supply a voltage suitable for charging the vehicle battery and use the high-voltage alternating current output as a power source for a grinder or the like, the vehicle battery is not damaged by overcharging or the like, and There is no need to secure a new power source for finishing work after welding.

Further, the on-vehicle power generator with a welding function of the present invention has a simple circuit configuration, requires a small number of parts, and can be manufactured with commercially available parts. Therefore, the parts can be easily procured and the manufacturing cost can be reduced. Since it can be kept low and the circuit can be distributed for each constituent element as needed, it can be easily installed in small vehicles, and energy loss can be reduced, so highly efficient welding function. It is possible to provide an in-vehicle power generator with a built-in power generator at a low price, which has excellent effects.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a generator according to an embodiment of the present invention.

FIG. 2 is a schematic circuit diagram of an in-vehicle power generator according to an embodiment of the present invention.

FIG. 3 is a timing diagram showing a method for controlling a switching element of an inverter circuit according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 generator 1'stator coil part 1a first stator coil 1b first stator coil tap 1c, 1d, 1e three-phase high-voltage AC output terminal 1f, 1g, 1h three-phase low-voltage AC output terminal 1i field coil 2 DC high voltage source 2a, 4 three-phase double-wave rectifier 2b Constant voltage stabilizing circuit 3 Inverter circuit 5 Welding device 5b Switch part 6 Key switch 7 Relay 8 Three-phase thyristor double-wave rectifier 9 Vehicle battery 11 Thyristor control part 12 Current control Circuit 13 Vehicle idle-up control unit 14 Idle-up device T1, T2 output terminals

Claims (3)

[Claims] 1. A first stator coil for generating a high-voltage alternating current, a second stator coil for generating a low-voltage alternating current, and a first and a second stator coils, which are driven by a running engine for a vehicle. A generator having a field coil that generates a magnetic field that acts on the stator coil, a first rectifier that rectifies the output current of the first stator coil, and a second rectifier that rectifies the output current of the second stator coil. And a third rectifier and the output of the first rectifier are stabilized by a DC voltage stabilizing circuit, converted into a stabilized high-voltage alternating current equivalent to that of a commercial AC power source via an inverter circuit, and An on-vehicle power generator with a welding function, which uses the output of the rectifier No. 2 as a DC power source for welding and supplies the output of the third rectifier to a vehicle battery for traveling, which controls the exciting current of the field coil. An external output control means for cutting off the output of the high voltage alternating current and a charging control means for cutting off the application of the charging current to the vehicle battery are provided with the current control means, and when the DC power source for welding is used. The load of the generator is reduced by shutting off the output of the high-voltage alternating current and the charging current, and when the DC power source for welding is not used, the applied voltage of the vehicle battery is the vehicle battery. With the welding function, the charging current is supplied to the vehicle battery while the excitation current of the field coil is controlled so that the voltage becomes the most suitable voltage for charging, and the output cutoff of the high-voltage alternating current is released. In-vehicle power generator. 2. A vehicle idle-up control means is provided to increase the rotational speed of a running engine for a vehicle to increase the output of the generator when the DC power source for welding is used. Item 1. A vehicle-mounted power generator with a welding function according to Item 1. 3. When the DC power source for welding is used, the high voltage is set based on the operation of a welding switch which is configured integrally with the welding device and is electrically connected in series with a running engine start switch of the vehicle. 3. The vehicle generator with a welding function according to claim 1, wherein at least one of the output of the voltage alternating current and the charging current is cut off.